TDI Helitrox CCR Diver


This is the second entry level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for mixed gas diving using a Helitrox diluent. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills, to a maximum of 45 metres / 150 feet, using an air/nitrox/helium diluent for formal decompression diving. Student are permitted to utilize a diluent and bailout mix with no greater than a 35% helium content (+/- 5%) and no less than a 21% oxygen content and are permitted to use up to 100% oxygen for decompression.



Class Duration:  Minimum of 6 hours academic development and 2 hours equipment maintenance workshop. The duration of the entire course must take a minimum of 5 days.



Course Structure

Confined Water Execution 

1. Minimum of 60 minutes confined water training to a maximum of 9 metres / 30 feet 


Open Water Execution 

1. Equipment configuration session, confined water session, and 50m fully-equipped CCR diver surface tow must be completed prior to
   open water training dives 

2. Minimum of 420 minutes open water training to be completed over a minimum of 7 dives with a gradual increase in depth each day to

    a maximum of 45 metres / 150 feet



Student Prerequisites

1. Minimum age 18 

2. Provide proof of 50 logged dives. If completing a unit crossover, provide proof of 10 logged CCR dives in the last 12 months 

3. Minimum certification level of TDI Advanced Nitrox Diver, Deco Procedures Diver or Helitrox diver or equivalent from agencies

    recognized by TDI 

4. If the rebreather is a TDI approved sidemount rebreather, the student must hold the TDI Sidemount Diver certification or equivalent,

    provide proof of 10 logged sidemount dives, and any additional requirements the sidemount rebreather manufacturer may have



1. Minimum age 18
2. TDI Air Diluent CCR Diver certified or equivalent
3. Minimum of 30 hours and 30 dives on the specific CCR unit
4. Six months CCR diving experience 



Required Equipment:  The following equipment is required for each student

1. A complete closed circuit rebreather. Any modifications to the unit must be approved by the manufacturer 

2. Minimum of 1 CCR dive computer and 1 backup OC/CCR computer for bailout in event of system failure 

3. Mask, fins and a suitable line-cutting device 

4. Slate and pencil 

5. Reel with a minimum of 50 metres / 165 feet of line 

6. Lift Bag / Delayed Surface Marker Buoy (DSMB) with adequate lift and size for the dive environmentand a backup. Required for open

   water environments only 

7. Exposure suit appropriate for the open water environment where training will be conducted 

8. Access to an oxygen/helium analyzer 

9. Appropriate weight 

10. Bailout gas supply cylinder with appropriate capacity of gas for planned dive 

Note: The instructor and any certified assistant will also carry a bailout gas supply during all open water sessions. This redundant gas source must be greater than the instructor and any certified assistant’s bailout requirements.

Total  Cost: $1800 (Includes E-learring and certification card upon course completion; Does not including required gear)

Rental of a rebreather is available upon request.

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